filter
In the context of signal processing and optics, its any device or computational approach for removing certain components from the signal (e.g., using an optical filter to detect only a desired spectral waveband).
See also: excitation filter, emission filter, interference filter, narrow-bandpass filter, bandpass filter, broad-bandpass filter, color conversion filter, color filter, heat filter, longpass filter, neutral density filter, polarizer, shortpass filter
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